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$419+ Cheap flights from Ontario (ONT) to Athens (ATH)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Nov 9 — Nov 161
Sun 11/9
Sun 11/16
1 adult, Economy
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Cheap flight deals from Ontario to Athens

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Athens (ATH). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 10, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$527
(United Airlines)

One-way from

$419
(Mytrip)

Popular in

June

Cheapest in

March

Average price

$836
Provider with most accurate pricing for Ontario-Athens Eleftherios V. flight deals.
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Provider most trusted by Cheapflights users for Ontario-Athens Eleftherios V. flights.
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From Ontario to Athens Eleftherios V.
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One-way flight from Ontario to Athens Eleftherios V.
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Highest demand for flights based on searches. 32% potential increase in price ($447 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($64 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Ontario to Athens

Cheapest flights from Ontario to Athens
Explore the most affordable flight options available from Ontario to Athens. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 10, 2025.

This United Airlines deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/87:00 amONT - ATH
2 stops42h 35mUnited Airlines
Sat 11/221:10 pmATH - ONT
2 stops43h 21mUnited Airlines
Deal found 10/8$527
This United Airlines deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:00 amONT - ATH
2 stops19h 35mUnited Airlines
Wed 11/192:20 pmATH - ONT
2 stops18h 31mUnited Airlines
Deal found 10/9$541
This United Airlines deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/71:50 pmONT - ATH
2 stops24h 35mUnited Airlines
Tue 12/166:25 amATH - ONT
2 stops26h 24mUnited Airlines
Deal found 10/9$561
This United Airlines deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/11:40 pmONT - ATH
2 stops24h 45mUnited Airlines
Mon 12/156:35 amATH - ONT
3 stops26h 14mUnited Airlines
Deal found 10/9$623
This Ovago deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/24:47 pmONT - ATH
2 stops22h 33mBritish Airways
Fri 12/127:45 amATH - ONT
2 stops24h 43mBritish Airways
Deal found 10/9$629
This United Airlines deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/229:36 amONT - ATH
2 stops22h 59mUnited Airlines
Wed 10/297:05 amATH - ONT
2 stops43h 29mUnited Airlines
Deal found 10/8$695
This United Airlines deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/99:36 amONT - ATH
2 stops27h 24mUnited Airlines
Wed 10/156:30 amATH - ONT
2 stops26h 00mUnited Airlines
Deal found 10/9$726
This United Airlines deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:36 pmONT - ATH
2 stops18h 24mUnited Airlines
Thu 10/1611:45 amATH - ONT
2 stops20h 45mUnited Airlines
Deal found 10/8$728
This United Airlines deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/86:27 pmONT - ATH
2 stops42h 33mUnited Airlines
Mon 10/136:00 amATH - ONT
2 stops26h 30mUnited Airlines
Deal found 10/8$734
This Ovago deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/54:47 pmONT - ATH
2 stops19h 08mBritish Airways
Fri 12/197:45 amATH - ONT
2 stops40h 07mBritish Airways
Deal found 10/9$737
This United Airlines deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/81:15 pmONT - ATH
2 stops19h 20mUnited Airlines
Fri 10/1711:45 amATH - ONT
2 stops40h 21mUnited Airlines
Deal found 10/8$742
This United Airlines deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/99:36 amONT - ATH
2 stops27h 24mUnited Airlines
Tue 10/1411:45 amATH - ONT
3 stops39h 38mUnited Airlines
Deal found 10/9$747

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Athens that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 10, 2025.
Use the filters below to find and compare flights from Ontario to Athens that are best for you.

Fly from

Ontario

Fly to

Athens

Route

Depart

Return

Price

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 11/8

7:00 am-11:35 am

2 stops42h 35m

Athens Eleftherios V.

Sat 11/22

1:10 pm-10:31 pm

2 stops43h 21m

$527

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 2/13

6:47 am-3:55 pm

2 stops23h 08m

Athens Eleftherios V.

Fri 2/27

7:45 am-11:43 pm

2 stops25h 58m

$554

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 1/10

1:20 pm-4:35 pm

2 stops17h 15m

Athens Eleftherios V.

Sat 1/24

6:35 am-5:51 pm

2 stops21h 16m

$563

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 12/1

1:40 pm-12:25 am

2 stops24h 45m

Athens Eleftherios V.

Mon 12/15

6:35 am-10:49 pm

3 stops26h 14m

$623

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 1/6

1:20 pm-4:35 pm

2 stops17h 15m

Athens Eleftherios V.

Tue 1/20

12:50 pm-10:53 pm

2 stops20h 03m

$626

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 10/22

9:36 am-6:35 pm

2 stops22h 59m

Athens Eleftherios V.

Wed 10/29

7:05 am-5:34 pm

2 stops43h 29m

$695

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 1/9

4:49 pm-9:55 pm

2 stops19h 06m

Athens Eleftherios V.

Fri 1/23

7:45 am-8:15 pm

2 stops22h 30m

$756

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 2/12

5:40 am-6:05 pm

2 stops26h 25m

Athens Eleftherios V.

Fri 2/27

6:05 am-10:57 pm

3 stops26h 52m

$764

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 10/30

1:15 pm-4:35 pm

2 stops18h 20m

Athens Eleftherios V.

Thu 11/13

6:05 am-5:09 pm

2 stops21h 04m

$810

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 10/20

6:00 am-2:00 pm

2 stops22h 00m

Athens Eleftherios V.

Mon 10/27

7:05 am-10:51 pm

2 stops24h 46m

$898

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 20 results
1
2

Compare providers for flights from Ontario to Athens

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Athens in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Athens flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Athens flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Athens flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Athens flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Athens flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Athens

Have a flexible travel schedule? Discover the best time to fly to Athens from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Athens

What is the cheapest month to book a flight from Ontario to Athens?

Currently, August is the cheapest month in which you can book a flight from Ontario to Athens (average of $433). Flying from Ontario to Athens in July is currently the most expensive (average of $601). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to ATH?

Find hourly flight availability from Ontario to Athens. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 10, 2025.

When flying from Ontario to Athens, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 25% versus a flight at noon.

What is the cheapest day to fly from Ontario to Athens?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Athens. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Athens flight should consider departing on Monday afternoons when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Athens

Get insights into the airlines that provide service to Athens. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Athens. Reviews last updated October 10, 2025.
Read reviews from past customers who have flown United Airlines from Ontario to Athens. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,968 reviews

Entertainment

7.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,968 reviews
United Airlines
7.4
Good
8,968 reviews

Entertainment

7.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Ontario to Athens. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Athens?

    Airlines like United Airlines and American Airlines fly from Ontario to Athens in about 23h 08m. The time it takes to get you to your destination can typically vary by up to 19h 27m. Ontario and Athens are separated by a distance of 6879 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Ontario to Athens round-trip?

    According to our current data, United Airlines ($635), offers the cheapest pricing from Ontario to Athens. United Airlines is priced at 33% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Ontario to Athens one-way?

    One-way options have recently been found by users for as low as $424 on United Airlines. Other airlines that offer cheap prices include Delta from $424 and Air Canada from $426 one-way.

  • Can I find deals for flights from Ontario to Athens that include hotel bookings?

    Yes. In addition to deals on Ontario to Athens flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Athens?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Athens.

  • Can I find deals for business class flights from Ontario to Athens?

    Yes. Cheapflights offers flight deals from Ontario to Athens by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Athens?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Athens (average of $433). Flying from Ontario to Athens in July is currently the most expensive (average of $601). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Athens?

Book flights to Athens if you plan to visit one of these locations
Glyfada
Piraeus
Tolo
Galaxidi

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Ontario to Athens

Discover the top airline that operate flights from Ontario to Athens. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$635Average$998FlexibilityNo cancel feeOn-time69%

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